cannot read property 'ShowIncidentState' of undefined

[kfi]

Hi,
Since upgrading to version 3.3.7 of OTRS from version 3.2.6 we get the following error when trying to create a new ticket from the webpage

cannot read property 'ShowIncidentState' of undefined
type error: Cannot read property 'ShowincidentState' of undefined at HTMLSelectElement....

This pops up through the application when ever the showincident state field is meant to be displayed, unfortunately thi stops the whole page from working.

Has anyone else had this issue? I have narrowed it down to the ITSM Incident and Problem module, but we require the functionality of this module so I can not simply remove it.
I have tried upgrading to 3.3.8 in our test environment but the issue still remains

Any suggestions would be greatly appreciated.

Thank you in advance.

[crythias]

custom themes? they won't work on upgrade
updated ITSM after upgrade of base?
third party plugins?
clear caches?

[kfi]

Hi,
vanilla install, only modifications through sysconfig on admin page,my understanding is these changes should survive upgrades?
ITSM version matches base, 3.3.7
No plugins
cache cleared, issue still persists.

Regards

[crythias]

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